Finding the Fourth Proportional to 13,319.71, 19,965.69 and 5,418.83

Step by Step Solution

1. Step 1: Write the proportion equation
   13,319.71 : 19,965.69 = 5,418.83 : x
2. Step 2: Convert to fraction form
   13,319.71/19,965.69 = 5,418.83/x
3. Step 3: Cross multiply
   13,319.71x = 19,965.69 × 5,418.83
4. Step 4: Simplify right side
   13,319.71x = 108,190,729.86
5. Step 5: Solve for x
   x = 108,190,729.86/13,319.71
6. Step 6: Final answer
   x = 8,122.61